Deprecation State
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Promoted to Vulkan 1.1
Contact
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Jeff Bolz jeffbolznv
Other Extension Metadata
- Last Modified Date
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2016-10-19
- IP Status
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No known IP claims.
- Contributors
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Jeff Bolz, NVIDIA
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Description
This extension provides instance-level commands to enumerate groups of
physical devices, and to create a logical device from a subset of one of
those groups.
Such a logical device can then be used with new features in the
VK_KHR_device_group extension.
Promotion to Vulkan 1.1
All functionality in this extension is included in core Vulkan 1.1, with the KHR suffix omitted. The original type, enum and command names are still available as aliases of the core functionality.
New Enum Constants
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VK_KHR_DEVICE_GROUP_CREATION_EXTENSION_NAME -
VK_KHR_DEVICE_GROUP_CREATION_SPEC_VERSION -
VK_MAX_DEVICE_GROUP_SIZE_KHR -
Extending VkMemoryHeapFlagBits:
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VK_MEMORY_HEAP_MULTI_INSTANCE_BIT_KHR
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Extending VkStructureType:
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VK_STRUCTURE_TYPE_DEVICE_GROUP_DEVICE_CREATE_INFO_KHR -
VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_GROUP_PROPERTIES_KHR
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Examples
VkDeviceCreateInfo devCreateInfo = { VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO };
// (not shown) fill out devCreateInfo as usual.
uint32_t deviceGroupCount = 0;
VkPhysicalDeviceGroupPropertiesKHR *props = NULL;
// Query the number of device groups
vkEnumeratePhysicalDeviceGroupsKHR(g_vkInstance, &deviceGroupCount, NULL);
// Allocate and initialize structures to query the device groups
props = (VkPhysicalDeviceGroupPropertiesKHR *)malloc(deviceGroupCount*sizeof(VkPhysicalDeviceGroupPropertiesKHR));
for (i = 0; i < deviceGroupCount; ++i) {
props[i].sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_GROUP_PROPERTIES_KHR;
props[i].pNext = NULL;
}
vkEnumeratePhysicalDeviceGroupsKHR(g_vkInstance, &deviceGroupCount, props);
// If the first device group has more than one physical device. create
// a logical device using all of the physical devices.
VkDeviceGroupDeviceCreateInfoKHR deviceGroupInfo = { VK_STRUCTURE_TYPE_DEVICE_GROUP_DEVICE_CREATE_INFO_KHR };
if (props[0].physicalDeviceCount > 1) {
deviceGroupInfo.physicalDeviceCount = props[0].physicalDeviceCount;
deviceGroupInfo.pPhysicalDevices = props[0].physicalDevices;
devCreateInfo.pNext = &deviceGroupInfo;
}
vkCreateDevice(props[0].physicalDevices[0], &devCreateInfo, NULL, &g_vkDevice);
free(props);Document Notes
For more information, see the Vulkan Specification
This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.